We don't usually write up news reports but this feel serious enough to translate and publish:

Police have reported that this evening, around 8pm, there was a fight between a group of people and a person who had been sitting in a car in the neighbourhood. One person is being treated at Danderyd Sjukhus for minor wounds caused by gunfire, a young person with wounds to his arm who took himself into hospital, according to Aftonbladet. The police are looking for at least one person suspected of attempted murder.